Abstract

The combination of transferred-echo double resonance (TEDOR) with rotational-echo double resonance (REDOR) has been used to measure an 8-A fluorine-carbon internuclear distance in a nine-residue fragment of the peptide antibiotic emerimicin. The fragment is 19 FCH 2 CO-Phe-MeA-MeA-[1- 13 C]MeA-[ 15 N]Val-Gly-Leu-MeA-MeA-OBzl (MeA=α-methylalanine or aminoisobutyric acid). The TEDOR part of this magic-angle-spinning, solid-state NMR experiment selects the 13 C label by its dipolar coupling to 15 N and suppresses the natural-abundance carbon background

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